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Single-Chip Charge and System Power-Path Management IC (bqTINY-III) (Rev. G)
Texas Instruments
Description
The bqTINY™ III-series of devices are highly integrated Li-ion linear chargers and system power-path management devices targeted at space-limited portable applications. The bqTINY III-series offer integrated USB-port and DC supply (AC adapter), power-path management with autonomous power-source selection, power FETs and current sensors, high accuracy current and voltage regulation, charge status, and charge termination, in a single monolithic device. The bqTINY III-series powers the system while independently charging the battery. This feature reduces the charge and discharge cycles on the battery, allows for proper charge termination and allows the system to run with an absent or defective battery pack. This feature also allows for the system to instantaneously turn on from an external power source in the case of a deeply discharged battery pack. The IC design is focused on supplying continuous power to the system when available from the AC, USB, or battery sources. The power select pin, PSEL, defines which input source is to be used first (primary source—AC or USB). If the primary source is not available, then the IC automatically switches over to the other secondary source if available or the battery as the last option. If the PSEL is set low, the USB input is selected first and if not available, the AC line is selected (if available) but programmed to a USB input limiting rate (100 mA/500 mA max). This feature allows the use of one input connector, where the host programs the PSEL pin according to what source is connected (AC adaptor or USB port). The bq24038 replaces USBPG
Features
Small 3,5 mm × 4,5 mm QFNPackageDesigned for Single-Cell Li-Ion- or Li-Polymer-Based Portable Applications Integrated Dynamic Power-Path Management (DPPM) Feature Allowing the AC Adapter or the USB Port to Simultaneously Power the System and Charge the BatteryPower Supplement Mode Allows Battery to Supplement the USB or AC Input CurrentAutonomous Power Source Selection (AC Adapter or USB)Integrated USB Charge Control With Selectable 100-mA and 500-mA Maximum Input Current Regulation Limits Dynamic Total Current Management for USBSupports Up to 2-A Total Current3.3-V Integrated LDO OutputThermal Regulation for Charge Control Charge Status Outputs for LED or System Interface Indicates Charge and Fault ConditionsReverse Current, Short-Circuit, and Thermal ProtectionPower Good (AC Adapter and USB Port Present) Status OutputsCharge Voltage Options: 4.1V, 4.2V, or 4.36VAPPLICATIONSSmart Phones and PDA MP3 PlayersDigital Cameras Handheld DevicesInternet Appliances bqTINY is a trademark of Texas Instruments.
Related Datasheets
| Part Number | Description | Category |
| • BQ24020 | Single-Chip Li-Ion & Li-Pol Charger IC w/Autonomous USB-Port & AC Adapt (Rev. E) | ICs, Interface |
| • BQ24030 | Single-Chip Charge and System Power-Path Management IC (bqTINY-III) (Rev. G) | ICs, Interface |
| • BQ24064 | 1A Single-Chip Li-Ion/Li-Pol Charge Management IC With Thermal Regulation (Rev. A) | ICs, Interface |
| • BQ24070 | Single-Chip Li-Ion Charge and System Power-Path Mangement IC (Rev. B) | ICs, Interface |
| • BQ24071 | Single-Chip Li-Ion Charge and System Power-Path Mangement IC (Rev. B) | ICs, Interface |
| • BQ24100 | Synchronous Switchmode, Li-Ion & Li-Pol Charge Mngmt IC (bqSwitcher) (Rev. L) | ICs, Interface |
| • BQ24103A | Synchronous Switchmode, Li-Ion & Li-Pol Charge Mngmt IC (bqSwitcher) (Rev. L) | ICs, Interface |
| • BQ24123 | Single-Chip Switchmode, Li-Ion & Li-Polymer Charge Mgmt IC w/enhanced EMI Perf (Rev. E) | ICs, Interface |
| • BQ24702 | Multichemistry Battery Charger Controller & System Power Selector (Rev. E) | ICs, Interface |
| • BQ25010 | Single Chip Charger and DC/DC Converter IC for Bluetooth (bqHYBRID) (Rev. B) | ICs, Interface |
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